from django.shortcuts import render
from django.views.generic import TemplateView

from commodity.models import Types, CommodityInfos


# Create your views here.
def indexView(request):
    """
    处理首页请求
    """
    title = "首页" #页面标题
    #当前网页为首页的时候，首页的class='active'
    #当前页为所有商品的时候，对应的class='active'
    classContent = "" #用于页面样式控制的变量
    #获取销量最高的8个商品，按照销量降序排列
    commodityInfos = CommodityInfos.objects.order_by("-sold").all()[:8]
    #获取所有的商品分类
    types = Types.objects.all()
    #筛选儿童服饰分类下的二级分类，以列表形式返回
    c1 = [x.seconds for x in types if x.firsts == '儿童服饰']
    #获取儿童服饰分类下销量最高的5个商品
    clothes = CommodityInfos.objects.filter(types__in=c1).order_by("-sold")[:5]
    #筛选奶粉辅食分类下的二级分类
    f1 = [x.seconds for x in types if x.firsts == '奶粉辅食']
    #获取奶粉辅食分类下销量最高的五个产品
    food = CommodityInfos.objects.filter(types__in=f1).order_by("-sold")[:5]
    #筛选儿童用品分类下的二级分类
    g1 = [x.seconds for x in types if x.firsts == '儿童用品']
    #
    goods = CommodityInfos.objects.filter(types__in=g1).order_by("-sold")[:5]
    #将所有的变量传递给模板进行渲染
    return render(request, 'index.html', locals())



class indexClassView(TemplateView):
    #指定渲染的模板
    template_name = 'index.html'
    #可选，指定模板引擎
    template_engine = None
    #可选，指定响应的content_type
    content_type = None
    #额外的模板上下文变量
    extra_context = {'title':'首页','classContent':''}

    #重写获取上下文数据的方法
    def get_context_data(self, **kwargs):
        #获取父类的上下文
        context = super(indexClassView, self).get_context_data(**kwargs)
        #获取销量最高的8个商品
        context['commodityInfos'] = CommodityInfos.objects.order_by("-sold").all()[:8]

        types = Types.objects.all()

        cl = [x.seconds for x in types if x.firsts == '儿童服饰']
        context['clothes'] = CommodityInfos.objects.filter(types__in=cl).order_by("-sold")[:5]
        fl = [x.seconds for x in types if x.firsts == '奶粉辅食']
        context['food'] = CommodityInfos.objects.filter(types__in=fl).order_by("-sold")[:5]
        gl = [x.seconds for x in types if x.firsts == '儿童用品']
        context['goods'] = CommodityInfos.objects.filter(types__in=gl).order_by("-sold")[:5]
        return context

    def get(self, request, *args, **kwargs):
        """
        处理HTTP GET请求
        request代表HTTP请求信息
        如果路由设置了路由变量，那么可以从蚕食kwargs中获取
        """
        #获取上下文数据
        context = self.get_context_data(**kwargs)
        #渲染模板并返回响应
        return self.render_to_response(context)

    def post(self, request, *args, **kwargs):
        """
        处理HTTP POST请求
        """
        context = self.get_context_data(**kwargs)
        return self.render_to_response(context)


def page_not_found(request,exception):
    return render(request, '404.html', status=404)


def page_error(request):
    return render(request, '404.html', status=500)